Question

go over the provided data and find lambda max and then plot the standardized graph using the second data table.

Pathlength = 1cm

Absorbance at 400 nm	0.04
Absorbance at 450 nm	0.08
Absorbance at 500 nm	0.12
Absorbance at 520 nm	0.18
Absorbance at 550 nm	0.22
Absorbance at 580 nm	0.19
Absorbance at 600 nm	0.16
Absorbance at 650 nm	0.09
Absorbance at 700 nm	0.04
Absorbance at 750 nm	0.02

Concentration of Solution	Absorbance
0.00100 M	0.06
0.00200 M	0.09
0.00300 M	0.13
0.00400 M	0.18
0.00500 M	0.22
Unknown solution	0.15

Answer 1

As it can be seen from the first chart clearly that the maximum absorbanve is at 550 nm

So lambda max = 550 nm

Now standardised graph

As seen from the graph drawn the unknown concentration is 0.0035 moles

I hope this helps. If you have any query or want more detailed explanation, feel free to ask in the comments section below